They were embedded from other places on the web and those links are no good any more for whatever reason. This tends to just be an issue in older posts, unless someone tries to share something that has protection on it to prevent embedding.

Thank-you for the speedy reply. I am new to the forum and I was just reading up on the old threads and some (not all) of the pictures that were clearly not loaded off the internet were not showing up. I found this frustrating and I was wondering if there was a way to fix this. (like updating a drive or something like that)